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First High-Resolution Spectroscopy of X-ray Absorption Lines in the Obscured State of NGC 5548

Multi-wavelength spectroscopy of NGC 5548 revealed remarkable changes due to presence of an obscuring wind from the accretion disk. This broadened our understanding of obscuration and outflows in AGN. Swift monitoring of NGC 5548 shows that…

高能天体物理现象 · 物理学 2024-01-09 Missagh Mehdipour , Gerard A. Kriss , Jelle S. Kaastra , Elisa Costantini , Liyi Gu , Hermine Landt , Junjie Mao , Daniele Rogantini

Anatomy of the AGN in NGC 5548 IV. The short-term variability of the outflows

During an extensive multiwavelength campaign that we performed in 2013-14 the prototypical Seyfert 1 galaxy NGC 5548 has been found in an unusual condition of heavy and persistent obscuration. The newly discovered "obscurer" absorbs most of…

高能天体物理现象 · 物理学 2015-05-12 L. Di Gesu , E. Costantini , J. Ebrero , M. Mehdipour , J. S. Kaastra , F. Ursini , P. O. Petrucci , M. Cappi , G. A. Kriss , S. Bianchi , G. Branduardi-Raymont , B. De Marco , A. De Rosa , S. Kaspi , S. Paltani , C. Pinto , G. Ponti , K. C. Steenbrugge , M. Whewell

Anatomy of the AGN in NGC 5548: VII. Swift study of obscuration and broadband continuum variability

We present our investigation into the long-term variability of the X-ray obscuration and optical-UV-X-ray continuum in the Seyfert 1 galaxy NGC 5548. In 2013 and 2014, the Swift observatory monitored NGC 5548 on average every day or two,…

高能天体物理现象 · 物理学 2016-04-06 M. Mehdipour , J. S. Kaastra , G. A. Kriss , M. Cappi , P. -O. Petrucci , B. De Marco , G. Ponti , K. C. Steenbrugge , E. Behar , S. Bianchi , G. Branduardi-Raymont , E. Costantini , J. Ebrero , L. Di Gesu , G. Matt , S. Paltani , B. M. Peterson , F. Ursini , M. Whewell

Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption…

星系天体物理 · 物理学 2019-09-04 G. A. Kriss , G. De Rosa , J. Ely , B. M. Peterson , J. Kaastra , M. Mehdipour , G. J. Ferland , M. Dehghanian , S. Mathur , R. Edelson , K. T. Korista , N. Arav , A. J. Barth , M. C. Bentz , W. N. Brandt , D. M. Crenshaw , E. Dalla Bontà , K. D. Denney , C. Done , M. Eracleous , M. M. Fausnaugh , E. Gardner , M. R. Goad , C. J. Grier , Keith Horne , C. S. Kochanek , I. M. Mchardy , H. Netzer , A. Pancoast , L. Pei , R. W. Pogge , D. Proga , C. Silva , N. Tejos , M. Vestergaard , S. M. Adams , M. D. Anderson , P. Arévalo , T G. Beatty , E. Behar , V. N. Bennert , S. Bianchi , A. Bigley , S. Bisogni , R. Boissay-Malaquin , G. A. Borman , M. C. Bottorff , A. A. Breeveld , M. Brotherton , J. E. Brown , J. S. Brown , E. M. Cackett , G. Canalizo , M. Cappi , M. T. Carini , K. I. Clubb , J. M. Comerford , C. T. Coker , E. M. Corsini , E. Costantini , S. Croft , K. V. Croxall , A. J. Deason , A. De Lorenzo-Cáceres , B. De Marco , M. Dietrich , L. Di Gesu , J. Ebrero , P. A. Evans , A. V. Filippenko , K. Flatland , E. L. Gates , N. Gehrels , Z S. Geier , J. M. Gelbord , L. Gonzalez , V. Gorjian , D. Grupe , A. Gupta , P. B. Hall , C. B. Henderson , S. Hicks , E. Holmbeck , T. W. -S. Holoien , T. A. Hutchison , M. Im , J. J. Jensen , C. A. Johnson , M. D. Joner , S. Kaspi , B. C. Kelly , P. L. Kelly , J. A. Kennea , M. Kim , S. C. Kim , S. Y. Kim , A. King , S. A. Klimanov , Y. Krongold , M. W. Lau , J. C. Lee , D. C. Leonard , Miao Li , P. Lira , C. Lochhaas , Zhiyuan Ma , F. Macinnis , M. A. Malkan , E. R. Manne-Nicholas , G. Matt , J. C. Mauerhan , R. Mcgurk , C. Montuori , L. Morelli , A. Mosquera , D. Mudd , F. Müller-Sánchez , S. V. Nazarov , R. P. Norris , J. A. Nousek , M. L. Nguyen , P. Ochner , D. N. Okhmat , S. Paltani , J. R. Parks , C. Pinto , A. Pizzella , R. Poleski , G. Ponti , J. -U. Pott , S. E. Rafter , H. -W. Rix , J. Runnoe , D. A. Saylor , J. S. Schimoia , K. Schnülle , B. Scott , S. G. Sergeev , B. J. Shappee , I. Shivvers , M. Siegel , G. V. Simonian , A. Siviero , A. Skielboe , G. Somers , M. Spencer , D. Starkey , D. J. Stevens , H. -I. Sung , J. Tayar , K. G. Teems , T. Treu , C. S. Turner , P. Uttley , J . Van Saders , L. Vican , C. Villforth , S. Villanueva , D. J. Walton , T. Waters , Y. Weiss , J. -H. Woo , H. Yan , H. Yuk , W. Zheng , W. Zhu , Y. Zu

Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind characteristics and contributions to the very broad emission lines of NGC 5548

In 2014 the NGC 5548 Space Telescope and Optical Reverberation Mapping campaign discovered a two-month anomaly when variations in the absorption and emission lines decorrelated from continuum variations. During this time the soft X-ray part…

星系天体物理 · 物理学 2020-08-12 M. Dehghanian , G. J. Ferland , G. A. Kriss , B. M. Peterson , K. T. Korista , M. R. Goad , M. Chatzikos , F. Guzman , G. de Rosa , M. Mehdipour , J. Kaastra , S. Mathur , M. Vestergaard , D. Proga , T. Waters , M. C. Bentz , S. Bisogni , W. N. Brandt , E. Dalla Bont`a , M. M. Fausnaugh , J. M. Gelbord , Keith Horne , I. M. McHardy , R. W. Pogge , D. A. Starkey

Discovery of a fast, broad, transient outflow in NGC 985

We observed the Seyfert 1 galaxy NGC 985 on multiple occasions to search for variability in its UV and X-ray absorption features in order to establish their location and physical properties. We use XMM-Newton to obtain X-ray spectra using…

星系天体物理 · 物理学 2016-01-27 J. Ebrero , G. A. Kriss , J. S. Kaastra , J. C. Ely

Anatomy of the AGN in NGC 5548: I. A global model for the broadband spectral energy distribution

An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken in 2013-2014 with XMM-Newton, Swift, NuSTAR, INTEGRAL,…

高能天体物理现象 · 物理学 2016-08-07 M. Mehdipour , J. S. Kaastra , G. A. Kriss , M. Cappi , P. -O. Petrucci , K. C. Steenbrugge , N. Arav , E. Behar , S. Bianchi , R. Boissay , G. Branduardi-Raymont , E. Costantini , J. Ebrero , L. Di Gesu , F. A. Harrison , S. Kaspi , B. De Marco , G. Matt , S. Paltani , B. M. Peterson , G. Ponti , F. Pozo Nuñez , A. De Rosa , F. Ursini , C. P. de Vries , D. J. Walton , M. Whewell

Simultaneous X-ray and UV spectroscopy of the Seyfert 1 galaxy NGC 5548.II. Physical conditions in the X-ray absorber

We present the results from a 500 ks Chandra observation of the Seyfert 1 galaxy NGC 5548. We detect broadened emission lines of O VII and C VI in the spectra, similar to those observed in the optical and UV bands. The source was…

天体物理学 · 物理学 2009-11-10 K. C. Steenbrugge , J. S. Kaastra , D. M. Crenshaw , S. B. Kraemer , N. Arav , I. M. George , D. A. Liedahl , R. L. J. van der Meer , F. B. S. Paerels , T. J. Turner , T. Yaqoob

X-ray spectroscopy of NGC 5548

We analyze the high-resolution X-ray spectrum of the Seyfert 1 galaxy NGC 5548, for the full 0.1-10 keV band, using improved calibration results of the Chandra-LETGS instrument. The warm absorber consists of at least three ionization…

天体物理学 · 物理学 2009-11-07 J. S. Kaastra , K. C. Steenbrugge , A. J. J. Raassen , R. L. J. van der Meer , A. C. Brinkman , D. A. Liedahl , E. Behar , A. de Rosa

Simple interpretation of the seemingly complicated X-ray spectral variation of NGC 5548

NGC 5548 is a very well-studied Seyfert 1 galaxy in broad wavelengths. Previous multiwavelength observation campaigns have indicated that its multiple absorbers are highly variable and complex. A previous study applied a two-zone partial…

高能天体物理现象 · 物理学 2022-05-09 Takuya Midooka , Ken Ebisawa , Misaki Mizumoto , Yasuharu Sugawara

HST/COS observations of the newly discovered obscuring outflow in NGC 3783

To understand the nature of transient obscuring outflows in active galactic nuclei, we observed the Seyfert 1 galaxy NGC 3783 on two occasions in December 2016 triggered by Swift monitoring indicating strong soft X-ray absorption in…

星系天体物理 · 物理学 2019-01-24 G. A. Kriss , M. Mehdipour , J. S. Kaastra , A. Rau , J. Bodensteiner , R. Plesha , N. Arav , E. Behar , S. Bianchi , G. Branduardi-Raymont , M. Cappi , E. Costantini , B. De Marco , L. Di Gesu , J. Ebrero , S. Kaspi , J. Mao , R. Middei , T. Miller , S. Paltani , U. Peretz , B. M. Peterson , P. -O. Petrucci , G. Ponti , F. Ursini , D. J. Walton , X. Xu

Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability

Lags measured from correlated X-ray/UV/optical monitoring of AGN allow us to determine whether UV/optical variability is driven by reprocessing of X-rays or X-ray variability is driven by UV/optical seed photon variations. We present the…

高能天体物理现象 · 物理学 2015-06-22 I. M. McHardy , D. T. Cameron , T. Dwelly , S. Connolly , P. Lira , D. Emmanoulopoulos , J. Gelbord , E. Breedt , P. Arevalo , P. Uttley

Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548

Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and the X-rays. This is the densest extended AGN UV/optical continuum sampling ever obtained, with a mean…

星系天体物理 · 物理学 2015-07-10 R. Edelson , J. M. Gelbord , K. Horne , I. M. McHardy , B. M. Peterson , P. Arevalo , A. A. Breeveld , G. De Rosa , P. A. Evans , M. R. Goad , G. A. Kriss , W. N. Brandt , N. Gehrels , D. Grupe , J. A. Kennea , C. S. Kochanek , J. A. Nousek , I. Papadakis , M. Siegel , D. Starkey , P. Uttley , S. Vaughan , S. Young , A. J. Barth , M. C. Bentz , B. J. Brewer , D. M. Crenshaw , E. Dalla Bonta , A. De Lorenzo-Caceres , K. D. Denney , M. Dietrich , J. Ely , M. M. Fausnaugh , C. J. Grier , P. B. Hall , J. Kaastra , B. C. Kelly , K. T. Korista , P. Lira , S. Mathur , H. Netzer , A. Pancoast , L. Pei , R. W. Pogge , J. S. Schimoia , T. Treu , M. Vestergaard , C. Villforth , H. Yan , Y. Zu

Suzaku Monitoring of the Seyfert 1 Galaxy NGC5548: Warm Absorber Location and its Implication for Cosmic Feedback

(Abridged) We present a two month Suzaku X-ray monitoring of the Seyfert 1 galaxy NGC 5548. The campaign consists of 7 observations. We analyze the response in the opacity of the gas that forms the ionized absorber to ionizing flux…

宇宙学与河外天体物理 · 物理学 2015-05-14 Y. Krongold , M. Elvis , M. Andrade-Velazquez , F. Nicastro , S. Mathur , J. N. Reeves , N. S. Brickhouse , L. Binette , E. Jimenez-Bailon , D. Grupe , Y. Liu , I. M. McHardy , T. Minezaki , Y. Yoshii , B. Wilkes

Long Term Wind-Driven X-Ray Spectral Variability of NGC 1365 with Swift

We present long-term (months-years) X-ray spectral variability of the Seyfert 1.8 galaxy NGC 1365 as observed by Swift, which provides well sampled observations over a much longer timescale (6 years) and a much larger flux range than is…

高能天体物理现象 · 物理学 2014-04-21 S. D. Connolly , I. M. McHardy , T. Dwelly

Space Telescope and Optical Reverberation Mapping Project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548

During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert~1 galaxy NGC 5548 performed from 2014 February to July, the normally highly correlated far-UV continuum and broad…

星系天体物理 · 物理学 2016-06-15 M. R. Goad , K. T. Korista , G. De Rosa , G. A. Kriss , R. Edelson , A. J. Barth , G. J. Ferland , C. S. Kochanek , H. Netzer , B. M. Peterson , M. C. Bentz , S. Bisogni , D. M. Crenshaw , K. D. Denney , J. Ely , M. M. Fausnaugh , C. J. Grier , A. Gupta , K. D. Horne , J. Kaastra , A. Pancoast , L. Pei , R. W. Pogge , A. Skielboe , D. Starkey , M. Vestergaard , Y. Zu , M. D. Anderson , P. Arevalo , C. Bazhaw , G. A. Borman , T. A. Boroson , M. C. Bottorff , W. N. Brandt , A. A. Breeveld , B. J. Brewer , E. M. Cackett , M. T. Carini , K. V. Croxall , E. Dalla Bonta , A. de Lorenzo-Caceres , M. Dietrich , N. V. Efimova , P. A. Evans , A. V. Filippenko , K. Flatland , N. Gehrels , S. Geier , G. M. Gelbord , L. Gonzalez , V. Gorjian , D. Grupe , P. B. Hall , S. Hicks , D. Horenstein , T. Hutchison , M. Im , J. J. Jensen , M. D. Joner , J. Jones , S. Kaspi , B. C. Kelly , J. A. Kennea , M. Kim , S. C. Kim , S. A. Klimanov , V. M. Larionov , J. C. Lee , D. C. Leonard , P. Lira , F. MacInnis , E. R. Manne-Nicholas , S. Mathur , I. M. McHardy , C. Montouri , R. Musso , S. V. Nazarov , R. P. Norris , J. A. Nousek , D. N. Okhmat , I. Papadakis , J. R. Parks , J. -U. Pott , S. E. Rafter , H. -W. Rix , D. A. Saylor , J. S. Schimoia , K. Schnulle , S. G. Sergeev , M. Siegel , M. Spencer , H. -I. Sung , K. G. Teems , T. Treu , C. S. Turner , P. Uttley , C. Villforth , Y. Weiss , J. -H. Woo , H. Yan , S. Young , W. -K. Zheng

Variability of the X-ray obscuring wind in Mrk 335 with XMM-Newton/RGS

Transient X-ray obscuration in Seyfert 1 galaxies is thought to arise from clumpy accretion-disk winds near the broad-line region (BLR), but the wind structure and its short-timescale variability are difficult to measure because…

高能天体物理现象 · 物理学 2026-02-27 Daniele Rogantini , Erin Kara , Luigi Gallo , S Komossa , Peter Kosec , Dan Wilkins , Ehud Behar , Joheen Chakraborty , Dirk Grupe , Missagh Mehdipour , Christos Panagiotou , Ciro Pinto , Irina Zhuravleva

STIS Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers

We have examined the physical conditions in intrinsic UV-absorbing gas in the Seyfert galaxy NGC 4151, using echelle spectra obtained with the Space Telescope Imaging Spectrograph (STIS). We confirm the presence of the kinematic components…

天体物理学 · 物理学 2009-11-06 S. B. Kraemer , D. M. Crenshaw , J. B. Hutchings , I. M. George , A. C. Danks , T. R. Gull , M. E. Kaiser , C. H. Nelson , D. Weistrop

An absorption event in the X-ray lightcurve of NGC 3227

We have monitored the Seyfert galaxy NGC 3227 with the Rossi X-ray Timing Explorer (RXTE) since January 1999. During late 2000 and early 2001 we observed an unusual hardening of the 2-10 keV X-ray spectrum which lasted several months. The…

天体物理学 · 物理学 2009-11-07 G. Lamer , P. Uttley , I. M. McHardy

Simultaneous X-ray and Ultraviolet spectroscopy of the Seyfert galaxy NGC 5548. III. X-ray time variability

The Seyfert 1 galaxy NGC 5548 was observed for a week by Chandra using both the HETGS and LETGS spectrometers. In this paper we study the time variability of the continuum radiation. During our observation, the source showed a gradual…

天体物理学 · 物理学 2009-11-10 J. S. Kaastra , K. C. Steenbrugge , D. M. Crenshaw , S. B. Kraemer , N. Arav , I. M. George , D. A. Liedahl , R. L. J. van der Meer , F. B. S. Paerels , T. J. Turner , T. Yaqoob